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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease liabilities | $ 85,674 | $ 85,516 |  |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  |  |  | $ 2,196
Operating lease right-of-use assets |  | $ 79,345 |  |  |
Retained Earnings [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  |  |  | 2,196
Other Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Contract cost | 18,100 |  | $ 17,000 |  |
Home Building [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease liabilities | 70,864 |  | 0 |  |
Customer deposits | 142,937 |  | 138,246 |  |
Restricted cash and cash equivalents | 18,337 |  | 16,982 |  |
Operating lease right-of-use assets | 63,505 |  | 0 |  |
Consolidated Joint Venture [Member] | Home Building [Member] | Other Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | $ 293 |  | $ 320 | $ 335 | $ 1,069

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